Mug and wireframe entirely disappeared
You have turned your viewport shading to "Rendered". 



In order to edit your mesh, you need to switch to either 


Material
Textured
Solid
Wireframe


Solid should be the default mode and is the most common mode for editing. 

You can use shortcuts to switch between modes:

Z --- Wireframe

Shift+Z --- Render View

Alt+Z --- Texture View